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From LotusScript to Java: Part 3
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Grant Lindsay    

Last time, we covered some Java basics:

  • Java is case-sensitive. This is just something you will need to get used to, even if it does seem restrictive at first.
  • Java is object-oriented. This should not be too difficult for most LotusScript developers, since we use classes and objects all the time in accessing Domino data.
  • There is a “Java Way” of doing things. There is a lot to learn here, but the reward is (hopefully) worth the journey, and you do not need to get it all at once; one step at a time.
  • You need to set up a Java development environment. That means the JDK from Oracle and your favorite text editor. The command line awaits.

Hopefully, you were able to get your Java development environment set up. If not, feel free to reach out in the comment section below and I will see if I can help. So, for those who are set to go, let’s go.

I mentioned that Java can be verbose, but it can also be powerful. I also asked you to think of a way using LotusScript to parse a string like 2014-02-15T12:08:56.235-0500 into a real date/time value. Let’s use this for the basis of our first Java program.

LotusScript-pt3

Here is how it will work

  1. Create a folder to hold your source code. I called mine, “Demo” and paced it under the Java folder on my machine.
    D:Program FilesJava>mkdir Demo
    
    D:Program FilesJava>dir
     Volume in drive D is Data
     Volume Serial Number is BCED-242A
    
     Directory of D:Program FilesJava
    
    04/15/2014  03:16 PM    <DIR>          .
    04/15/2014  03:16 PM    <DIR>          ..
    04/15/2014  03:16 PM    <DIR>          Demo
    01/17/2014  01:58 PM    <DIR>          jdk1.6.0_35
    01/17/2014  01:43 PM    <DIR>          jdk1.7.0_51
    01/17/2014  01:59 PM    <DIR>          jre6
    01/17/2014  01:43 PM    <DIR>          jre7
                   0 File(s)              0 bytes
                   8 Dir(s)  19,048,337,408 bytes free
  2. Use a text editor to create a file called DateParse.java and paste the source code into the new file. (The source code is in the next section.)
  3. Save it.
    D:Program FilesJavaDemo>dir
     Volume in drive D is Data
     Volume Serial Number is BCED-242A
    
     Directory of D:Program FilesJavaDemo
    
    04/15/2014  03:03 PM    <DIR>          .
    04/15/2014  03:03 PM    <DIR>          ..
    04/15/2014  12:05 PM               632 DateParse.java
                   1 File(s)            632 bytes
                   2 Dir(s)  19,048,292,352 bytes free
  4. Compile your program.
    D:Program FilesJavaDemo>..jdk1.6.0_35binjavac DateParse.java

    Use the path to your java compiler (javac.exe)
    No news is good news. If the program compiles successfully, there will be no message from the compiler. If there is any output, these will be either errors or warnings.

  5. Run your program.
    D:Program FilesJavaDemo>..jdk1.6.0_35binjava DateParse
    Input: 2014-02-15T12:08:56.235-0500
    Output: Sat Feb 15 12:08:56 EST 2014

javac.exe does the compiling, java.exe does the running.
Code. Compile. [Fix Compile Errors.] Run. [Fix Run Errors.] Repeat.

Source Code

Here is the source code, simplified for copying:

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateParse {
    public static void main(String[] args) {
        try {
            String input = "2014-02-15T12:08:56.235-0500";
            String dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
            SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);
            Date output = formatter.parse(input);
            System.out.println("Input: " + input);
            System.out.println("Output: " + output);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}

Here is the source code, annotated for learning:

01 /* These are the classes that our program will need.
02  * Though Java comes with thousands of classes, we need to tell the compiler
03  * which ones we are actually going to use.
04  * The java "import" statement is like the LotusScript, "Use" statement.
05  */
06 import java.text.ParseException;
07 import java.text.SimpleDateFormat;
08 import java.util.Date;
09
10 // This is our main class. Our program's starting point.
11 // The Java Runtime Environment (JRE)--the system that will actually run our 
12 // compiled code--looks for this class. It is required that the file name 
13 // match the class name.
14 public class DateParse {
15
16     // Our main class needs... well, a "main" method.
17     // The declaration needs to look just like this. Here is what each
18     // keyword means:
19     //
20     // public - The method is visible (can be called) from other objects of
21     //          other types.
22     // static - The method is associated with the class, not a specific
23     //          instance (object) of that class. This means that you can
24     //          call a static method without creating an object of the class.
25     // void   - The method has no return value.
26     //
27     // The JRE needs this method to be declared just like this so that it
28     // can start our program. It will find our class, DateParse, and
29     // call the DateParse.main() method, passing in an array of Strings, if
30     // there were any provided on the command line.
31     public static void main(String[] args) {
32
33         // The "try... catch" construct is Java's error handling, called,
34         // "exception handling."
35         // We'll pick up the details of this later. For now, think of this 
36         // like "On Error Goto" in LotusScript.
37         try {
38             // A string that represents our date to parse.
39             // (Tip: We could have also passed this value on the command 
40             // line and extracted from the "args" array.)
41             String input = "2014-02-15T12:08:56.235-0500";
42             
43             // A string that describes the pieces of our date string.
44             String dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
45             
46             // The set up: A built-in class that will do the hard work 
47             // for us. If this class existed in LotusScript, this line 
48             // might look like:
49             //
50             // Dim Formatter as New SimpleDateFormat(DateFormat)
51             //
52             SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);
53             
54             // The call: Now, we call the method to do the work.
55             // The parse() method takes our string that represents a date, 
56             // parses it using the pattern we provided in the previous line, 
57             // and returns the result as an actual Date object.
58             // We store the result in "output," which we have declared as a Date.
59             Date output = formatter.parse(input);
60
61             // Now, we print the input and out put to the console.
62             System.out.println("Input: " + input);
63             System.out.println("Output: " + output);
64
65         catch (ParseException e) {
66             // The parse() method can complain if the pattern doesn't match the 
67             // input. It complains by "throwing an exception," like LotusScript 
68             // calls can encounter run-time errors.
69             // The catch block will get called if that happens. Here, we just
70             // print the exception details to the console.
71             e.printStackTrace();
72         }
73     }
74 }

Comparisons

Here are the explanation and comparisons of our first Java program to what we know from LotusScript:

Statement Endings

LotusScript
New line

Dim strFoo As String
strFoo = "foo"
Java
Semicolon

String strFoo = "foo";

Comments

LotusScript
Single Line:

'

or

REM

Multiline/Block:

%REM
    ...
%END REM
Java
Single Line:

//

Multiline/Block:

/*
    ...
*/

Including Outside Libraries

LotusScript
Use "My Library"
Java
import java.text.SimpleDateFormat;

Variable Declarations

LotusScript
Dim strInput As String
strInput = "foo"
Java
String strInput;
strInput = "foo";

You can also combine the declaration and the assignment:

String strInput = "foo";

Method Declarations

LotusScript
Returns a value:

Public Function GetCount() As Integer
    ...
    GetCount = 0
End Function

Does not return a value:

Public Sub PrintCount()
    ...
End Sub
Java
Returns a value:

public int getCount() {
    ...
    return 0;
}

Does not return a value:

public void printCount() {
    ...
}

(More help on the date parsing formats can be found on Oracle’s website.)

I hope this was helpful. It is just a start, but you should feel good about getting a development environment set up and creating your first Java program. Don’t worry if you got stuck or something didn’t work as expected – that has happened to all of us, and it is part of the learning process for anything new.

Next time, we will move over to Domino Designer and begin working with Domino data. Feel free to reach out for help in the comment section below.



---------------------
http://www.sherpasoftware.com/blog/from-lotusscript-to-java-part-3/
May 02, 2014
6 hits



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